It's not uncommon to get multiple coins in one scoop. Like either on the dry sand @ a pocket spill. Or after beach erosion where mother nature deposits scores of objects in very confined zones.
The closest I've ever heard of multiple rings, was a guy I knew who had 3 rings, back-to-back. He dug the first, then took 2 steps got another beep. It was another gold ring. The turned 180* and took another 2 steps. Got another gold ring. 3 gold rings in the space of 2 minutes, forming a triangle shape.
It had been after beach erosion has put all the heavy targets into concise zones. That was the 1977-78 storms.
A similar situation to another friend during the 1982-83 storms that raked our coast: 7 gold rings in 15 minutes. He had gotten into a zone that was exclusively heavy objects (fishing sinkers and gold rings). And since this beach is very touristy, with almost zero fishing, his 7 gold rings were only broken by a fishing sinker or two between each of the rings. Sick sick sick.